Seiko Cal. 4428 - 103

Seiko 4428-103

This Hand-Winding model from 1965 features a 43mm Hardlex-Coated Steel case. Powered by the 4428 caliber with 36j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-171f65b9eae8]

Also known as: Helmet, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
15.7mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
200m
Dial Color
Navy
Jewels
36j
Frequency
28,800 bph
Power Reserve
67 hours
Year
1965

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seikata-wm-171f65b9eae8